Do you do regular backups? If your backup system breaks and stop making new backups, what will let you know? What if your RAID is failing, running out of space, remounted read-only after an error?
I have found that "machine is online" is usually not what I need monitoring for, at all. I'll notice if it's down. It's all the mission-critical-but-silently-breakables that I bother to monitor.
I have found that "machine is online" is usually not what I need monitoring for, at all. I'll notice if it's down. It's all the mission-critical-but-silently-breakables that I bother to monitor.